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        /* 多重if语句 */
        var score = 80
        if (score > 90) {
            console.log("优秀")
        } else if (score > 80) {
            console.log("良好")
        } else if (score > 70) {
            console.log("中等")
        } else if (score > 60) {
            console.log("及格")
        } else {
            console.log("不及格")
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